10mm of stem above steerer, ok?

I just got a new Salsa threadless stem, and the stack height is 50mm rather than the 40mm I had before. In order to get the bars in the position I want them, I have 8-10mm of stem above the top of the steerer rather than the general 3-5. The top clamp bolt is actually still below the top of the steerer by a few millimeters, and I have about 40mm of stem clamping the steerer. I can't imagine that I'm encountering any safety issues here with such a tall stem stack height and the fact that both bolts are still below the top of the steerer, but does anyone disagree?

If the centerline of you highest stem/steerer clamp bolt is below the top of the steerer, I don't see it being a big problem. This assumes you have a metal steerer -- I wouldn't mess with it if it's a carbon steerer.

If the centerline of you highest stem/steerer clamp bolt is below the top of the steerer, I don't see it being a big problem. This assumes you have a metal steerer -- I wouldn't mess with it if it's a carbon steerer.

Nope, aluminum it is. And the top of the bolt is actually well below the top of the steerer, by 3-5 mm I'd say.

You've reduced your clamping surface area, and you've introduced a stress riser at the top of the steerer. It's less safe than the way it's supposed to be.

I think I've actually increased the clamping surface area. Before I had a stack height of 40mm with about 3mm above the steerer, for a clamping surface area of 37mm. Now I have a stack height of 50mm, but with 10mm above the steerer. That gives me a clamping surface area of 40mm, more than before.

I think I've actually increased the clamping surface area. Before I had a stack height of 40mm with about 3mm above the steerer, for a clamping surface area of 37mm. Now I have a stack height of 50mm, but with 10mm above the steerer. That gives me a clamping surface area of 40mm, more than before.

Stack height is really a property of the headset, you're talking about the clamp length of the stem.

So you may have more surface area clamping the steerer than you did with your old stem, but you have less than the amount the new stem was designed for. I don't know how much of an issue it is, but it's some amount less safe than if you had steer tube all the way up.

Sorry to dredge this up out of the past, but I have some questions, because I have a similar situation.

Realistically (not company statements made for insurance purposes), what are the possible consequences of running a stem where the steerer tube lines, say, just below the top pinchbolt? Why is this "less safe"? Slippage? Failure? How? Inquiring minds want to know.

Sorry to dredge this up out of the past, but I have some questions, because I have a similar situation.

Realistically (not company statements made for insurance purposes), what are the possible consequences of running a stem where the steerer tube lines, say, just below the top pinchbolt? Why is this "less safe"? Slippage? Failure? How? Inquiring minds want to know.

And yes, I know, the solution is a stem with more rise.

I would say slippage would be the first thing that could happen, which would lead to failure of some kind; whether it's a suddenly loose headset or an actual breakage.

Try to imagine the scenarios that would result from the failure of any part of your fork/stem/bar interface. Anyone who ever does any climbing or sprinting, or even a vigorous acceleration from a stoplight should never compromise in this area. It's just not worth the risk.